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Under what pressure conditions CuSO(4). ...

Under what pressure conditions `CuSO_(4). 5H_(2)O` be efforscent at `35^(@)C`. How good a drying agent is `CuSO_(4).3H_(2)O` at the same temperature? Given
`CuSO_(4).5H_(2)O(s) hArr CuSO_(4).3H_(2)O.3H_(2)O(s)+2H_(2)O(v)`
`K_(p)=1.268xx10^(-3) atm^(2)` at `35^(@)C`. Vapoure pressure of water at `35^(@)C` is `25.0 mm Hg`.

Text Solution

Verified by Experts

An efforescent salt is one that loses `H_(2)O` to atmosphere for the reaction,
`CuSO_(4).5H_(2)O(s) hArr CuSO_(4).3H_(2)O(s)+2H_(2)O(v)`
`K_(p)=(P'_(H_(2)O))=1.268xx10^(-3)`
`:. P'_(H_(2)O)=0.0356 "atm"=27.0 mm Hg`
`:' "Given" P'_(H_(2)O)` at `35^(@)C`, (i.e. 25.0 mm Hg) lt `27.0 mm Hg` and thus, reaction will proceed in forward direction, i.e.,
`CuSO_(4).5H_(2)O(s) hArr CuSO_(4).3H_(2)O(s)+2H_(2)O(v)`
Thus, `CuSO_(4).5H_(2)O` will acts as efflorescent
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Under what pressure conditions CuSO_(4).5H_(2)O be efforescent at 25^(@)C . How good a drying agent is CuSO_(4).3H_(2)O at the same temperature? Given CuSO_(4).5H_(2)O(s) hArr CuSO_(4).3H_(2)O(s)+2H_(2)O(v) K_(p)=1.086xx10^(-4) atm^(2) at 25^(@)C . Vapour pressure of water at 25^(@)C is 23.8 mm of Hg.

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